A.Yes，you will. B.Sorry，it’s not valid on subwaytrains. C.Yes，I can. D.Sorry，I don’t know.
A.For your safety，please hold the handrail. B.We are sorry to inform that the limit measures will be taken because of the crowd，please wait patiently. C.Please stand in line to get on the train. D.Go through the gate one by one，please.
A.左邊 B.右邊 C.正前方 D.正上方
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